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assets: PNG-sourced palettes and nametables, plus --memory-map PRG reporting

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Implements three items from docs/future-work.md's
"PNG-sourced palette and nametable assets" section:

- `palette Name @palette("file.png")` — the parser accepts a PNG
  shortcut form; the asset resolver decodes the image via the
  new `png_to_palette` helper, mapping each pixel's RGB to the
  nearest NES master-palette index and building a 32-byte blob
  that enforces the universal-first-byte convention (same as
  the grouped-form parser). Errors cleanly on missing files or
  more than 16 unique colours.

- `background Name @nametable("file.png")` — the parser accepts
  a PNG shortcut form; the resolver decodes a 256×240 image into
  a 960-byte tile-index table (deduplicating up to 256 unique
  8×8 tiles) plus a 64-byte attribute table (bucketed by
  average quadrant brightness). CHR data is not yet generated
  automatically — callers still need to provide matching CHR
  via the existing sprite / `@chr(...)` pipeline; the
  limitation is documented on the `png_to_nametable` helper
  and can be lifted in a follow-up.

- `--memory-map` now prints a "PRG ROM data blobs" section
  listing each palette (32 B) and background (960 + 64 B)
  under its linker-assigned label, plus a grand total. The
  memory-map code is factored into `write_memory_map` which
  takes a writer so unit tests can drive it against a
  `Vec<u8>`. Memory-map printing moved to after the link step
  so palette/background CPU addresses are available.

Call-site changes: `resolve_palettes` and `resolve_backgrounds`
now take a `source_dir` path and return `Result<_, String>`
because PNG decoding can fail. Updated the CLI driver,
benches/compile.rs, and every integration-test compile helper.

All 23 committed examples rebuild byte-identical; 525 lib
tests + 72 integration tests + 3 bin tests pass; clippy clean.
This commit is contained in:
Claude 2026-04-14 03:01:32 +00:00
parent b575921c8e
commit 8610aecdac
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10 changed files with 1095 additions and 69 deletions
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6
benches/compile.rs
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@ -108,8 +108,10 @@ fn compile_pipeline(source: &str, source_dir: &Path) -> Vec<u8> {
let sprites = assets::resolve_sprites(&program, source_dir).expect("sprite resolution failed");
let sfx = assets::resolve_sfx(&program).expect("sfx resolution failed");
let music = assets::resolve_music(&program).expect("music resolution failed");
let palettes = assets::resolve_palettes(&program);
let backgrounds = assets::resolve_backgrounds(&program);
let palettes =
assets::resolve_palettes(&program, source_dir).expect("palette resolution failed");
let backgrounds =
assets::resolve_backgrounds(&program, source_dir).expect("background resolution failed");
let mut instructions = IrCodeGen::new(&analysis.var_allocations, &ir_program)
.with_sprites(&sprites)